Although potentially deployed as a stationary or floating power plant, the Russian RITM-200 is primarily intended to provide propulsion for the next generation of Russian ice-breakers. It is a 50 MWe compact integral system reactor that uses a

Figure 2.8 RITM-200 (Russian Federation) — OKBM Afriantov © Joint Stock Company ‘Afriantov OKB Mechanical Engineering’.

fuel type and configuration similar to the KLT-40S. The vertically mounted four main reactor coolant pumps are external to the reactor pressure vessel, as are the control rod drives mechanisms and a gas pressurizer. Four internal steam generators extract heat from the primary coolant system. Because of the external main coolant pumps and pressurizer, additional water injection systems are provided to mitigate the consequences of a large break loss-of-coolant accident.

By moving the steam generator into the reactor pressure vessel, the reactor system and containment is very compact compared to the KLT-40S. With overall dimensions of 6.4 m X 6.4 m X 15.5 m and weighing approximately 1200 ton, the RITM-200 occupies 45% less volume and is 35% lighter while producing 40% more power than the KLT-40S. It is expected to operate continuously for 26 000 hours (3.5 years) and be refueled after 7 years. Key parameters and a representative graphic for the RITM-100 design are given in Figure 2.8. [6]